From 9e621e99a5b908dbb0426cf57e35d7d89cef9dda Mon Sep 17 00:00:00 2001
From: Jason Parker <jparker@digium.com>
Date: Sat, 6 Jan 2007 00:24:38 +0000
Subject: [PATCH] Save 1 whopping byte of allocated memory!

This looks like it may have been a chicken/egg scenario..

You had to call a cleanup func, because everything was allocated.
Then since you had to call a cleanup func, you were forced to allocate - ie; strdup("").


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@49742 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
 main/pbx.c         | 12 ++++--------
 pbx/pbx_config.c   |  2 +-
 res/res_features.c |  2 +-
 3 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/main/pbx.c b/main/pbx.c
index d981a994c4..0c3c884728 100644
--- a/main/pbx.c
+++ b/main/pbx.c
@@ -4591,10 +4591,6 @@ static int ext_strncpy(char *dst, const char *src, int len)
 	return count;
 }
 
-static void null_datad(void *foo)
-{
-}
-
 /*! \brief add the extension in the priority chain.
  * returns 0 on success, -1 on failure
  */
@@ -4616,7 +4612,8 @@ static int add_pri(struct ast_context *con, struct ast_exten *tmp,
 		   replacement?  If so, replace, otherwise, bonk. */
 		if (!replace) {
 			ast_log(LOG_WARNING, "Unable to register extension '%s', priority %d in '%s', already in use\n", tmp->exten, tmp->priority, con->name);
-			tmp->datad(tmp->data);
+			if (tmp->datad)
+				tmp->datad(tmp->data);
 			free(tmp);
 			return -1;
 		}
@@ -4634,7 +4631,8 @@ static int add_pri(struct ast_context *con, struct ast_exten *tmp,
 		if (tmp->priority == PRIORITY_HINT)
 			ast_change_hint(e,tmp);
 		/* Destroy the old one */
-		e->datad(e->data);
+		if (e->datad)
+			e->datad(e->data);
 		free(e);
 	} else {	/* Slip ourselves in just before e */
 		tmp->peer = e;
@@ -4718,8 +4716,6 @@ int ast_add_extension2(struct ast_context *con,
 		length ++;	/* just the '\0' */
 
 	/* Be optimistic:  Build the extension structure first */
-	if (datad == NULL)
-		datad = null_datad;
 	if (!(tmp = ast_calloc(1, length)))
 		return -1;
 
diff --git a/pbx/pbx_config.c b/pbx/pbx_config.c
index 6980ca197b..25fe7ddce5 100644
--- a/pbx/pbx_config.c
+++ b/pbx/pbx_config.c
@@ -2409,7 +2409,7 @@ static void pbx_load_users(void)
 		}
 		if (!ast_strlen_zero(iface)) {
 			/* Add hint */
-			ast_add_extension2(con, 0, cat, -1, NULL, NULL, iface, strdup(""), ast_free, registrar);
+			ast_add_extension2(con, 0, cat, -1, NULL, NULL, iface, NULL, NULL, registrar);
 			/* If voicemail, use "stdexten" else use plain old dial */
 			if (hasvoicemail) {
 				snprintf(tmp, sizeof(tmp), "stdexten|%s|${HINT}", cat);
diff --git a/res/res_features.c b/res/res_features.c
index 22c1d66ca6..1d8f2be65d 100644
--- a/res/res_features.c
+++ b/res/res_features.c
@@ -2277,7 +2277,7 @@ static int load_config(void)
 		ast_log(LOG_ERROR, "Parking context '%s' does not exist and unable to create\n", parking_con);
 		return -1;
 	}
-	res = ast_add_extension2(con, 1, ast_parking_ext(), 1, NULL, NULL, parkcall, strdup(""), ast_free, registrar);
+	res = ast_add_extension2(con, 1, ast_parking_ext(), 1, NULL, NULL, parkcall, NULL, NULL, registrar);
 	if (parkaddhints)
 		park_add_hints(parking_con, parking_start, parking_stop);
 	if (!res)